Question

A transformers has an efficiency of 80% .It is connected to a power output of kw and 100 V.If the secondary voltage is 240 V,the secondary current is

• A. 4.6 A
• B. 40 A
• C. 4.3 A
• D. 13.3 A

Answer 1

The correct option is D 13.3 A

$P=4kw=4000w$

$\eta =80v$ $v_s=240$

$100\times B$ primary current = $4000$

Primary current = $\frac{4000}{100}=40A$

$\frac{4000\times 80}{100}=240\times$ secondary current

$\therefore$ secondary current = $13.34A$